Legend of The Lost Video Game I think this game has the potential to become something great, given the time you didn't have during the jam to balance and expand on it's content. There's always going to be bugs in your first game, and especially in a jam game where the submission deadline has since passed.
You might want to look into more options for controls. The enter key is a little awkward to use since it's right above the arrow keys, and the up/down arrows scroll the page when you press them (there's code to fix that somewhere on the internet), unless your full version won't be a web game.
I think you should incorporate something to do with the title in the game itself, because the title is what caught my attention. This seems like a game which features classic mechanics from it's genre, like keys, moving platforms, and combat. Experiment with these mechanics and see if you can come up with interesting puzzles, and maybe even an interesting story.
